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AP Biology: Evolution Drives the Diversity and Unity of Life Drill 1, Problem 4. Hardy-Weinberg equilibrium requires that a population meet all of the following criteria except what?

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Transcript

00:03

Here's an unshmoopy question for ya.

00:06

Hardy-Weinberg equilibrium requires that a population meet all of the following criteria

00:12

EXCEPT... what? And here are the potential answers...

00:18

EXCEPT. Make sure you've read the question carefully because that EXCEPT word always

00:24

comes back and bites us.

00:26

This question asks us about the Hardy-Weinberg equilibrium.

00:29

While it may sound like a merger between a couple of boy sleuths and a Hollywood agent...

00:33

...the Hardy-Weinberg equilibrium is actually a really important principle in evolution.

00:38

It states that from one generation to the next, the genetic variation in a population

00:44

will remain constant....under a few conditions.

00:47

Here's a mnemonic that'll help us remember what the conditions are for a Hardy-Weinberg population.

00:54

Large Maggie Moo Really Sleeps.

00:58

It stands for...Large, Mutations, Migration, Random-mating, Selection.

01:07

L for Large: The population is infinitely large... so A is true. We can cross that one off.

01:13

M for: mutations are not occurring. Nope, not in our answer choices.

01:18

M for: migration is not occurring in or out of the population. That one looks like D....but

01:24

let's make sure...

01:25

R for: random mating occurs...meaning B is true...cross that one off.

01:32

And S for: natural selection isn't occurring. We can cross off C, too.

01:38

Since we've gone through the entire mnemonic, it looks like migration should NOT occur for

01:43

the conditions of Hardy-Weinberg equilibrium. This makes a lot of sense, because if the

01:47

organisms in a population kept migrating and mating in and out of the population...

01:52

...it'd be really hard to keep equilibrium of the genetic variation in a population.

01:57

D's our answer. This answer explanation is now over, but we're

02:00

Hardly-Whining.

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